Consider the following sequence of operations on three empty stacks (S1, S2, S3) in a consecutive manner:

Operation on Stack	Stack in use
PUSH(3)	S1
PUSH(13)	S2
PUSH(23)	S1
PUSH(15)	S3
PUSH(7)	S1
PUSH(17)	S3
PUSH(27)	S2
POP()	S2
PUSH(19)	S1
PUSH(27)	S2
POP()	S1
POP()	S3
P = POP()	S1
Q = POP()	S2
R = POP()	S3

What will be the result of ((Q-P)+R-10)/5 this expression?

Note: The P,Q,R are variable which holds the value of that respective operation.